EP1916282A1 - Wasserbasislack und lackiertes stahlblech - Google Patents

Wasserbasislack und lackiertes stahlblech Download PDF

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Publication number
EP1916282A1
EP1916282A1 EP05768446A EP05768446A EP1916282A1 EP 1916282 A1 EP1916282 A1 EP 1916282A1 EP 05768446 A EP05768446 A EP 05768446A EP 05768446 A EP05768446 A EP 05768446A EP 1916282 A1 EP1916282 A1 EP 1916282A1
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Prior art keywords
water
group
coating composition
acid
calcium carbonate
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EP05768446A
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English (en)
French (fr)
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EP1916282A4 (de
EP1916282B1 (de
Inventor
Masato NIPPON PAINT MAR. COAT. CO. LTD. MORIMOTO
Hideo NIPPON PAINT MARINE COATINGS CO.LTD FUKUDA
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Nippon Paint Marine Coatings Co Ltd
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Nippon Paint Marine Coatings Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/10—Block or graft copolymers containing polysiloxane sequences
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • C09D163/10—Epoxy resins modified by unsaturated compounds
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C09D5/082—Anti-corrosive paints characterised by the anti-corrosive pigment
    • C09D5/084—Inorganic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/66—Additives characterised by particle size
    • C09D7/67—Particle size smaller than 100 nm
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/66—Additives characterised by particle size
    • C09D7/68—Particle size between 100-1000 nm
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
    • C09J183/14—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/08—Ingredients agglomerated by treatment with a binding agent
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
    • C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials
    • C08L2666/14—Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof

Definitions

  • the present invention relates to a water-base coating composition and a coated steel sheet.
  • Solvent type coatings have mainly been used for anticorrosion coating in large structures, such as ships, bridge, tanks and plants.
  • the demand for water-base coatings using water as a solvent has recently been increasing due to consideration of environmental preservation, such as reduction in volatile organic compounds (VOC) and consideration of the safety during coating or storage of coatings.
  • VOC volatile organic compounds
  • Patent document 1 discloses an aqueous dispersion of a vinyl-modified epoxy ester resin having a specific structure. It also discloses that a coating film formed with a water-base coating composition containing the aqueous dispersion has excellent corrosion resistance. However, even if coating is carried out using such coating compositions, the problems mentioned above cannot be solved completely.
  • Patent document 2 discloses a specific block polymer containing a polyorganosiloxane unit and a polyalkylene oxide unit. It is disclosed that when a small amount of the block polymer is added to a coating material, it can impart surface modification effects, such as a surface tension regulating function and an adhesiveness imparting function, to the coating material. However, use of this compound for an anticorrosive, ambient temperature curing type coating is not disclosed.
  • Patent document 3 discloses calcium carbonate suitable for incorporation into water-based coating compositions. However, use of this coating for water-base coatings that are required to have high anticorrosion property is not disclosed.
  • an object of the present invention is to provide a water-base coating composition and a coated steel sheet coated with the water-base coating composition, the composition being suitable for use in ships, bridges, etc. and having excellent gloss, coating film appearance and anticorrosion property, which properties do not deteriorate even in coating under high humidity conditions.
  • the present invention is a water-base coating composition including an aqueous dispersion type vinyl-modified epoxy ester resin and calcium carbonate, wherein the calcium carbonate is precipitated calcium carbonate treated with a salt of a vinyl polymer having a carboxyl group and is contained in the coating composition in a proportion of from 20 to 50% by volume in a solid content, and a volume ratio of pigment/total solid content of the coating is 50% or less.
  • the calcium carbonate has an average particle diameter of from 0.01 to 0.5 ⁇ m.
  • the salt of a polymer having a carboxyl group be a sodium, ammonium and/or amino salt of a vinyl polymer obtained by polymerizing a vinyl monomer composition containing at least one ⁇ , ⁇ unsaturated dicarboxylic acid selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, maleic acid and itaconic acid.
  • the aqueous dispersion type vinyl-modified epoxy ester resin is desirably one obtained by subjecting a condensate (c) produced by condensing an epoxy resin (a) and a fatty acid (b) as essential components and a vinyl monomer composition (d) containing an acid group-containing monomer to graft polymerization.
  • the amount of the mixture (d) of the vinyl compounds is not less than 15 parts by mass based on 100 parts by mass of the combined weight of the condensate (c) and the mixture (d).
  • the water-base coating composition further contains a silicone-modified epoxy resin.
  • the silicone-modified epoxy resin includes a compound represented by the following general formula (1): wherein U 1 is -O(R 3 O) b -, where R 3 is -(CH 2 ) c - or -CH 2 CH(CH 3 )-, and U 2 is a structure represented by or U 1 is a structure represented by and U 2 is -O(R 3 O) b -, where R 3 is -(CH 2 ) c - or -CH 2 CH(CH 3 )-, wherein R 1 and R 2 are each an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 10 carbon atoms or an aralkyl group having 7 to 9 carbon atoms, R 4 is hydrogen or a methyl group, a is an integer of from 1 to 135, b is an integer of from 2 to 230 and c is an integer of from 1 to 4, A is an organic group bonding to its adjoining -CHR 4 - with a carbonyl group inter
  • the present invention is also directed to a coated steel sheet having a coating film formed from the water-base coating composition mentioned above.
  • the water-base coating composition of the present invention contains a specific water-dispersible resin and also contains a relatively large amount of calcium carbonate having been subjected to a specific treatment. That is, incorporation of calcium carbonate relatively more than usual can increase the thickness of a coating film in coating. If it is possible to thicken a coating film, the anti-corrosiveness will thereby be enhanced. As a result of this, it is possible to improve the anti-corrosiveness. Further, choosing a specific species as the calcium carbonate for use prevents occurrence of problems such as deterioration in appearance. Therefore, a coating composition is obtained which solves all the problems, namely, to provide a water-base, ambient temperature drying coating, to improve anti-corrosiveness, and to maintain appearance and the like. In addition, the water-base coating composition of the present invention has an excellent property in that deterioration in appearance of a coating film does not occur even if coating is performed under high humidity conditions.
  • the water-base coating composition of the present invention contains calcium carbonate in a proportion of from 20 to 50% by volume in a solid content. This can increase the viscosity of the coating and therefore it is possible to increase the thickness of a coating film formed by one coating operation. As a result, it is possible to improve the anticorrosion property of a coating film.
  • the amount of the calcium carbonate to be incorporated is preferably from 20 to 50% by volume, and more preferably from 30 to 50% by volume. If it is less than 20% by volume, the above-mentioned effects can not be obtained sufficiently. If it is more than 50% by volume, coating film appearance, such as gloss, will be affected.
  • the calcium carbonate is precipitated calcium carbonate treated with a salt of a vinyl polymer having a carboxyl group.
  • the precipitated calcium carbonate thus treated exerts good dispersibility in water and therefore it will not cause problems such as deterioration in appearance even when it is incorporated in an amount as large as from 20 to 50% by volume in a solid content.
  • the water-base coating composition of the present invention may be one which further contains a pigment other than the above-mentioned calcium carbonate. In such a case, it must be contained in a proportion such that the volume ratio of a pigment/a total solid content of the coating may be 50% by volume or less. By adjusting the amount to within the above-mentioned range, it is possible to maintain the gloss of a coating film and it therefore is possible to form a coating film with good appearance.
  • Examples of other pigment which can be used for the water-base coating composition of the present invention include extenders such as precipitated barium sulfate, clay and talc; coloring pigments such as titanium oxide and carbon; and rust preventive pigments such as zinc phosphate.
  • the salt of a vinyl polymer having a carboxyl group is desirably a sodium, ammonium and/or amino salt of a vinyl polymer obtained by polymerizing a vinyl monomer composition containing at least one ⁇ , ⁇ -unsaturated dicarboxylic acid selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, maleic acid and itaconic acid.
  • the salt of a vinyl polymer having a carboxyl group is desirably a copolymer of an ⁇ , ⁇ -unsaturated monocarboxylic acid (acrylic acid, methacrylic acid, crotonic acid, etc.) and an ⁇ , ⁇ -unsaturated dicarboxylic acid (maleic acid, itaconic acid, and the like). It is more desirable that the amount of the ⁇ , ⁇ -unsaturated dicarboxylic acid is 120 parts by mass or less based on 100 parts by mass of the ⁇ , ⁇ -unsaturated monocarboxylic acid.
  • the salt of a vinyl polymer having a carboxyl group desirably has a number average molecular weight of from 500 to 50000. By adjusting to within such a range, it is possible to achieve a favorable treatment on calcium carbonate.
  • the number average molecular weight is a value obtained, in terms of polystyrene, through measurement by gel permeation chromatography (GPC).
  • the salt of a vinyl polymer having a carboxyl group can be obtained by performing polymerization of the monomer in a solvent such as water and organic solvents, and neutralizing the resulting vinyl polymer with a sodium compound, an ammonium compound, an organic amine compound, or the like.
  • the treatment of the calcium carbonate with the salt of a vinyl polymer having a carboxyl group may be a treatment by wet grinding, drying/powderization, or the like. In the treatment, it is desirable to cause from 0.01 to 10 parts by mass, based on 100 parts by mass of the calcium carbonate solid content, of the salt of a vinyl polymer having a carboxyl group to be adsorbed.
  • the average particle diameter of the calcium carbonate is desirably from 0.01 to 0.5 ⁇ m. If it is less than 0.01 ⁇ m, a problem that the calcium carbonate easily flocculates and the storage stability of a coating will deteriorate may arise. If it exceeds 0.5 ⁇ m, a problem that good gloss of a coating film can not be obtained may arise.
  • the average particle diameter as referred to herein is the length of a side of a cubic crystal determined from the specific surface area measured by the gas absorption method (BET method), while assuming calcium carbonate particles to be cubic particles.
  • a commercially available product may also be used as the calcium carbonate treated with the salt of a vinyl polymer having a carboxyl group.
  • LUMINUS manufactured by Maruo Calcium Co., Ltd.
  • the water-base coating composition of the present invention contains the aqueous dispersion type vinyl-modified epoxy ester resin.
  • the aqueous dispersion type vinyl-modified epoxy ester resin is a resin obtained by modifying an epoxy ester resin with a compound containing a vinyl group and is a water-dispersible, ambient temperature curing resin. It has a characteristic of being excellent particularly in anticorrosion property.
  • the aqueous dispersion type vinyl-modified epoxy ester resin is desirably one obtained by subjecting a condensate (c) produced by condensing an epoxy resin (a) and a fatty acid (b) as essential components and the vinyl monomer composition (d) containing an acid group-containing monomer to graft polymerization.
  • the aqueous dispersion type vinyl-modified epoxy ester resin obtained by the method shown above has a particularly excellent characteristic with respect to anticorrosion property.
  • the proportions of the epoxy resin (a) and the fatty acid (b) used in the synthesis of the condensate (c) it is desirable to use them so that the equivalent ratio of the epoxy groups in the epoxy resin may be in excess of that of the carboxyl groups originating in a fatty acid.
  • epoxy resin (a) examples include various epoxy resins such as bisphenol type epoxy resins, alicyclic epoxy resins, phenol novolak type epoxy resins, polyethylene glycol-based epoxy resins, and epoxidized polybutadiene.
  • EPICLON 850, 1050, 3050, 4050, 7050 epoxy resins manufactured by Dainippon Ink & Chemicals, Inc.
  • EPICOAT 828, 834, 1001, 1004, 1007, 1009 epoxy resins manufactured by Shell, Netherlands
  • DER 660,661J, 662,664J, 667J, 668,669J epoxy resins manufactured by the Dow Chemical Co., Ltd. USA
  • UNOX 201, 289 epoxy resins manufactured by Union Carbide Corporation, U.S.A.
  • UNOX 201, 289 epoxy resins manufactured by Union Carbide Corporation, U.S.A.
  • EPICLON N-740, 775 (Dainippon Ink & Chemicals, Inc.) may be used, for example.
  • EPICOAT 812 epoxy resin manufactured by Shell, Netherlands
  • EPOLIGHT 40E, 200E, 400E epoxy resins manufactured by Kyoeisha Chemical Co., Ltd.
  • BF-1000 an epoxy resin manufactured by Adeka Argus Industry Co., Ltd.
  • Adeka Argus Industry Co., Ltd. an epoxy resin manufactured by Adeka Argus Industry Co., Ltd.
  • the epoxy resin (a) may be used singly or as a mixture of two or more kinds thereof. It is more desirable to use a bisphenol type epoxy resin because of its excellent corrosion resistance as a major ingredient.
  • the fatty acid (b) is not particularly restricted and examples thereof include drying oil fatty acids such as tung oil fatty acid, linseed oil fatty acid, dehydrated caster oil fatty acid, castor oil fatty acid, tall oil fatty acid, cottonseed oil fatty acid, soybean oil fatty acid, olive oil fatty acid, safflower oil fatty acid and rice bran oil fatty acid, or nondrying oil fatty acids such as hydrogenated coconut oil fatty acid, coconut oil fatty acid and palm oil fatty acid.
  • drying oil fatty acids such as tung oil fatty acid, linseed oil fatty acid, dehydrated caster oil fatty acid, castor oil fatty acid, tall oil fatty acid, cottonseed oil fatty acid, soybean oil fatty acid, olive oil fatty acid, safflower oil fatty acid and rice bran oil fatty acid, or nondrying oil fatty acids such as hydrogenated coconut oil fatty acid, coconut oil fatty acid and palm oil fatty acid.
  • fatty acids such as oleic acid, linoleic oil, linolenic acid, eleostearic acid, ricinoleic acid, and saturated fatty acids such as octylic acid, lauric acid and stearic acid purified from those oil fatty acid.
  • the fatty acid may be used singly or as a mixture of two or more kinds thereof.
  • An unreacted epoxy group originating in the epoxy resin (a) may be capped with an acid group-containing compound.
  • Examples of the acid group-containing compound include organic carboxylic acids such as benzoic acid, p-tert-benzoic acid, isooctanoic acid, isodecanoic acid, cyclohexanoic acid, phthalic acid, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, himic acid (a product of Hitachi Chemical Co., Ltd.), maleic acid, fumaric acid, adipic acid, sebacic acid, dimer acid, trimellitic acid and pyromellitic acid.
  • organic carboxylic acids such as benzoic acid, p-tert-benzoic acid, isooctanoic acid, isodecanoic acid, cyclohexanoic acid, phthalic acid, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, himic acid (a product of Hitachi Chemical Co., Ltd.), maleic acid, fumaric acid, adipic acid, se
  • Examples of such a monobasic acid compound (e) include conventional organic carboxylic acids such as benzoic acid, p-tert-benzoic acid, isooctanoic acid, isodecanoic acid and cyclohexanoic acid.
  • the epoxy ester and the mixture (d) of the vinyl compounds containing an acid group-containing monomer are subjected to polymerization reaction in the presence of a radical polymerization initiator under heating conditions, in an organic solvent if necessary, to obtain a graft polymerization product of the epoxyester and the vinyl compound (vinyl-modified epoxy ester resin).
  • the reaction may be performed under a gauge pressure within the range of from 1 to 100 kg/cm 2 , and at a reaction temperature within the range of from 50 to 150°C. In some cases, polymerization may be performed under a pressure more than the above and at a temperature lower than the above.
  • the amount of nonvolatile matter in polymerization is desirably within the range of from 1 to 90% by mass, and more desirably within the range of from 40 to 80% by mass.
  • the mixture (d) of the vinyl compounds containing an acid group-containing monomer is desirably a mixture containing an aromatic vinyl compound, an alkyl (meth)acrylate having an alkyl group having 4 or more carbon atoms, and an acid group-containing vinyl compound.
  • the amount of the mixture (d) of the vinyl compounds containing an acid group-containing monomer is 15 parts by mass or more based on 100 parts by mass of the combined amount of the condensate (c) containing the epoxy resin (a) and the fatty acid (b) and the mixture (d) of the vinyl compounds containing an acid group-containing monomer.
  • the amount of the mixture (d) of the vinyl compounds containing an acid group-containing monomer is 15% or less, a product failing to have a desired balance between corrosion resistance and hardness will be obtained.
  • the vinyl-modified epoxy ester resin has an acid group derived from the acid group-containing monomer, and this acid group is essential for make it water-base in a step which will be performed later.
  • the concentration of the acid group is desirably within the range of from 15 to 50 gmKOH/g in terms of the acid value of the solid content in the vinyl-modified epoxy ester resin. When it is within this range, it is possible to achieve dispersion in water well and also achieve good adhesiveness to a substrate or pigment dispersing property. It is also possible to obtain excellent performances caused by water of a resulting coating film, namely, corrosion resistance, water resistance, alkali resistance, and the like.
  • the number average molecular weight of the vinyl-modified epoxy ester resin be within the range of from 1,000 to 100,000.
  • a product having a number average molecular weight within the above range is excellent in corrosion resistance, water resistance, etc., and can also be dispersed well in water.
  • the acid group-containing monomer include monomers having a carboxyl group (A), such as monocarboxylic acids having an unsaturated double bond, e.g.
  • (meth)acrylic acid 2-carboxyethyl acrylate, crotonic acid, vinylacetic acid, monovinyl adipate, monovinyl sebacate, monomethyl itaconate, monomethyl maleate, monomethyl fumarate, mono[2-(meth)acryloyloxyethyl] succinate, mono[2-(meth)acryloyloxyethyl] phthalate, mono[2-(meth)acryloyloxyethyl] hexahydrophthalate and sorbic acid; and unsaturated dicarboxylic acids, e.g. itaconic acid, maleic acid and fumaric acid.
  • unsaturated dicarboxylic acids e.g. itaconic acid, maleic acid and fumaric acid.
  • cycloalkyl (meth)acrylates alkyl-substituted cycloalkyl (meth)acrylates; (meth)acrylates having an alkyl or aralkyl group (B); and aromatic vinyl compounds (C).
  • (A) which is an essential ingredient, an alkyl (meth)acrylate having an alkyl group having 4 or more carbon atoms, a cycloalkyl group or an alkyl-substituted cycloalkyl group, and more preferably an alkyl (meth)acrylate having an alkyl group having 4 or more carbon atoms among the monomers (B) shown above.
  • monomers (A), (B) and (C) is preferred.
  • monomers shown below can also be used as the mixture (d) of vinyl compounds containing an acid group-containing monomer: ⁇ -alkoxyalkyl (meth)acrylates (D); vinyl esters of carboxylic acids (E); crotonic acid esters (F); unsaturated dibasic acid diesters (G); cyano group-containing vinyl monomers (H); fluoroolefins (I); chlorinated olefins (J); ⁇ -olefins (K); alkyl vinyl ethers (L); cycloalkyl vinyl ethers (M); tertiary amide group-containing vinyl monomers (N); (meth)acrylic acid esters containing a hydroxyl group (O); allyl compounds containing a hydroxyl group (P); vinyl ether compounds containing a hydroxyl group (Q); unsaturated carboxylic acid amide compounds containing a hydroxyl group (R); unsaturated fatty acids containing a hydroxy
  • the amount of the mixture (d) of the vinyl compounds containing acid group-containing monomers used is desirably 15 parts by mass or more based on 100 parts by mass of the combined amount of the condensate (c) containing the epoxy resin (a), the fatty acid (b) and, if necessary, the monobasic acid compound (e) and the mixture (d) of the vinyl compounds containing acid group-containing monomers.
  • This raw material proportions are determined in consideration of the balance of the corrosion resistance and the hardness of a coating film to be obtained.
  • the amount of the mixture (d) of the vinyl compounds containing acid group-containing monomers less than 15 parts by will result in a coating film lacking a desired balance between corrosion resistance and hardness.
  • radical polymerization initiator used for the reaction of the mixture (d) of the vinyl compounds containing acid group-containing monomers is not particularly restricted, if it is one generally used. Such radical polymerization initiator may be used singly or in combination of two or more.
  • the amount of the radical polymerization initiator used is preferably within the range of from 0.1 to 10 parts by mass based on 100 parts of all the monomers (mixture (d) of the vinyl compounds containing acid group-containing monomers).
  • the amount of the radical polymerization initiator, the reaction temperature and a chain transfer agent may be used.
  • the chain transfer agent include alkylmercaptans such as n-octylmercaptan, n-dodecylmercaptan and tert-dodecylmercaptan; aromatic mercaptans such as benzylmercaptan and dodecylbenzylmercaptan; and thiocarboxylic acids such as thiomalic acid, their salts, alkyl esters, or polythiols.
  • the amount of the chain transfer agent may depend on the amount of the radical polymerization initiator used and the reaction temperature. In obtaining a polymer having a relatively low molecular weight, a chain transfer agent may be used in an amount of from 0.2 to 30% by mass based on the weight of all monomers.
  • graft polymerization may be performed with use of an organic solvent.
  • Use of an organic solvent can reduce the viscosity of the reactant and therefore makes it possible to efficiently obtain a uniform product.
  • the organic solvent for use for this purpose is not particularly restricted and any organic solvent may be used if it is an organic solvent conventionally used.
  • the resulting vinyl-modified epoxy ester resin may be made water-base by neutralizing part or all of the acid groups in the resin with a neutralizer, and subsequently adding water. In such a way, an aqueous dispersion of the vinyl-modified epoxy ester resin can be prepared.
  • the aqueous dispersion type vinyl-modified epoxy ester resin can be formed by neutralizing part or all of the acid groups in the resulting vinyl-modified epoxy ester resin with a basic compound, and dissolving or dispersing the neutralized polymer in water.
  • an emulsifier and/or a dispersion stabilizer may be used together.
  • the emulsifier various types of emulsifiers, such as ionic emulsifiers, e.g. anionic emulsifiers and cationic emulsifiers, and nonionic emulsifiers may be used.
  • the anionic emulsifiers are not particularly restricted and examples thereof include alkyl(benzene) sulfonate salts, alkyl sulfates, polyoxyethylene alkylphenol sulfate salts, styrene sulfonate salts, vinyl sulfate salts, or their derivatives.
  • the cationic emulsifiers are not particularly restricted and examples thereof include lauryltrimethylammonium chloride, didecyldimethylamnmonium chloride and lauryldimethylbenzylammonium chloride.
  • the nonionic emulsifiers are not particularly restricted and examples thereof include polyoxyethylene alkylphenol ethers, polyoxyethylene alkyl ethers, polyoxyethylene higher fatty acid esters, ethylene oxide-propylene oxide block copolymers, or their derivatives. These may be used singly or in combination of two or more thereof.
  • the amount of the emulsifier used is desirably within a range up to 10 parts by mass based on 100 parts by mass of the total resin solid content, and more desirably within the range of from 0.1 to 5 parts by mass.
  • the water-base coating composition of the present invention further contains the above-mentioned silicone-modified epoxy resin.
  • inclusion of the silicone-modified epoxy resin is preferred also because the adhesiveness of a coating film is improved more.
  • the silicone-modified epoxy resin preferably is a compound represented by general formula (1) and/or a compound represented by the general formula (2).
  • the organic group contained in A in general formulas (1) and (2) has, for example, at least one chemical structural moiety selected from the group consisting of nonreactive hydrocarbon groups, a hydroxyl group, acid groups, an amino group, an ammonium group, a cyano group, a halogen atom, an amide bond, a cyclic ether group, an alkylene oxide unit, an alkoxy silyl group, an ultraviolet-absorbing group and a tetramethyl-4-piperidyl group.
  • the acrylic compound in an amount of from 1.8 to 2.2 molar times as much as the diamine compound and to use the diepoxy compound in an amount of from X+0.8 to X+1.2 moles for X moles of the product.
  • the silicone-modified epoxy resin can be obtained also by the steps of subjecting a diamine compound having one unit selected from the group consisting of a polyalkylene oxide unit and a polyorganosiloxane unit and having a primary amino group at each of both terminals to a Michael addition reaction to an acrylic compound represented by general formula (3), thereby providing a product; further reacting the product with a diepoxy compound having a unit other than the unit which the diamine compound has and having an epoxy group at each of both terminals, thereby obtaining a silicone-modified epoxy resin having epoxy groups at both terminals; and reacting a secondary amine compound to the epoxy groups at both terminals of the resulting silicone-modified epoxy resin.
  • silicone-modified epoxy resin by the steps of subjecting a diamine compound represented by the following general formula (4) to a Michael addition reaction to an acrylic compound represented by general formula (3), thereby obtaining a product; and further reacting the product with a diepoxy compound represented by the following general formula (5): wherein R 1 and R 2 are each an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 10 carbon atoms or an aralkyl group having 7 to 9 carbon atoms, a is an integer of from 1 to 135. wherein R 3 is -(CH 2 ) c - or -CH 2 CH(CH 3 )-, and b is an integer of from 2 to 230.
  • the method for the preparation of the silicone-modified epoxy resin includes the steps of subjecting a diamine compound represented by the following general formula (6) to a Michael addition reaction to an acrylic compound represented by general formula (3), thereby obtaining a product; and further reacting the product with a diepoxy compound represented by the following general formula (7): H 2 N-C 3 H 6 O(R 3 O) b C 3 H 6 -NH 2 (6) wherein R 3 is -(CH 2 ) c - or -CH 2 CH(CH 3 )-, and b is an integer of from 2 to 230.
  • R 1 and R 2 are each an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 10 carbon atoms or an aralkyl group having 7 to 9 carbon atoms, and a is an integer of from 1 to 135.
  • the silicone-modified epoxy resin can be obtained also by the steps of subjecting a diamine compound represented by the above general formula (4) or (6) to a Michael addition reaction to an acrylic compound represented by the above general formula (3), thereby obtaining a product; further reacting the product with a diepoxy compound represented by the above general formula (5) or (7), thereby obtaining a silicone-modified epoxy resin having epoxy groups on its both terminals; and reacting a secondary amine compound to the epoxy groups at both the terminals of the resulting silicone-modified epoxy resin.
  • the water-base coating composition of the present invention can be used, if necessary, after incorporation of additives suitable for various applications, for example, various known and conventional additives such as metal driers, antioxidants, defoaming agents and thickeners.
  • the water-base coating composition of the present invention may also be used together with various water-base resins.
  • Such resins are desirably resins having active hydrogen-containing groups.
  • the form, kind and the like thereof are not restricted.
  • the method for the production of the water-base coating composition is not particularly restricted and it can be prepared, for example, by dispersing the aforementioned calcium carbonate filler and other pigments with a resin or additive for pigment dispersion or, in some cases, the water-based vinyl-modified epoxy ester resin, thereby preparing a mill base of a pigment, and then adding the water-based vinyl-modified epoxy ester resin, various additives and water or solvent for adjusting the viscosity, followed by well mixing.
  • the water-base coating composition of the present invention can be coated by airless coating or a conventional method using a brush, a trowel, a roller or the like.
  • airless coating is preferred.
  • the film thickness in coating it is desirable that a dry coating film has a thickness of from 50 to 200 ⁇ m. If the dry film thickness exceeds 250 ⁇ m, problems with respect to sagging property or the like will arise.
  • the water-base coating composition of the present invention be used for coating on metal materials, such as iron-based substrates, zinc-based substrates and aluminum-based substrates. It is particularly suitable for coating large structures made of the above-mentioned base materials. Furthermore, it can be used suitably for ship cabin coating, in which deterioration of gloss due to increase in humidity may become a serious problem since coating in a hermetically sealed space is needed.
  • the present invention also encompasses the aforementioned coated steel sheet having a coating film formed from the water-base coating composition mentioned above.
  • the water-base coating composition of the present invention is an ambient drying water-base coating composition having excellent properties such as gloss, coating film appearance, anticorrosion property and moisture resistance. Because of being excellent in such physical properties, coating compositions for coating ships, bridges and the like, which have been difficult to be water-base, can be made water-base.
  • the amount of the vinyl compound used is about 24% based on 100 parts by mass of the combined amount of the vinyl compounds and the condensate (c) containing the epoxy resin and the fatty acid.
  • the resulting vinyl-modified epoxy ester resin was a viscous solution containing 80% of non-volatile matter.
  • the acid value of the solid content in the solution was 30 mgKOH/g.
  • aqueous dispersion of the resulting vinyl-modified epoxy ester resin was an aqueous dispersion having a solid content concentration of 35% and a pH of 9.2.
  • LUMINUS manufactured by Maruo Calcium Co., Ltd.
  • LUMINUS manufactured by Maruo Calcium Co., Ltd.
  • titanium oxide as a pigment
  • BYK-028 manufactured by BYK Japan KK
  • DICNATE 3111 manufactured by Dainippon Ink & Chemicals, Inc.
  • SN thickener 636 manufactured by Sannopuko, Inc.
  • Water-base coating compositions were prepared in the same manner as in Example 1, except for changing the recipe given in Table 1.
  • Example 4 0.2 part of the above-mentioned silicone-modified epoxy resin was further added to an aqueous dispersion.
  • Calcium carbonate A is LUMINUS (manufactured by Maruo Calcium Co., Ltd.)
  • calcium carbonate B is SUPER 1700 (manufactured by Maruo Calcium Co., Ltd.).
  • Calcium carbonate B which is a product without treatment, does not satisfy the requirements of the calcium carbonate of the present invention.
  • Each of coating films of the water-base coating compositions obtained in Example 1 to 5 and Comparative Examples 1 to 3 was checked for its gloss.
  • Each of the water-base coating compositions was applied with an applicator and dried in two ways, namely, at 20°C, 50% relative humidity for 1 day and at 20°C, 90% relative humidity for 1 day.
  • the applicator was selected so that the film thickness of a dry coating film might become 80 ⁇ 5 ⁇ m.
  • the 60° specular glossiness of the resulting coating films were measured.
  • Example 1 to 5 In order to evaluate the coating film appearance of the water-base coating compositions obtained in Example 1 to 5 and Comparative Examples 1 to 3, sagging property was examined. Using a sag tester, the water-base coating composition was applied onto a panel made of a glass sheet and the specimen was immediately caused to stand vertically. Whether sagging of a coating occurs or not depending on the thickness of the sample layer was examined.
  • the sag tester had six gaps, namely, 20, 25, 30, 35, 40 and 45mil.
  • Example 1 to 5 Each of the water-base coating compositions obtained in Example 1 to 5 and Comparative Examples 1 to 3 were applied on an undercoating and then the adhesiveness was examined.
  • An oil-base rust preventive coating CR MARINE WHITE PRIMER M (manufactured by Nippon Paint Marine Coatings Co., Ltd.) was spray coated to a 7 cm ⁇ 15 cm steel plate (shot blast steel plate) and then dried at 20°C for 7 days.
  • the thickness of the undercoating was 40 ⁇ 5 ⁇ m and the thickness of the top coating was 80 ⁇ 5 ⁇ m.
  • This test plate was exposed to a neutral salt spray test machine of JIS K5600-7-1 for 200 hours.
  • Table 1 clearly shows that the water-base coating composition by the present invention has been improved in gloss, coating film appearance, anticorrosion property and moisture resistance.
  • the water-base coating composition containing a calcium carbonate filler and a vinyl-modified epoxy ester resin having a specific resin composition has excellent gloss, coating film appearance, anticorrosion property and moisture resistance.
  • the water-base coating composition of the present invention can be used suitably for coating in the fields of ships and bridges where high anticorrosion property and appearance are required.

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EP05768446A 2005-08-03 2005-08-03 Lack auf wasserbasis und beschichtetes stahlblech Active EP1916282B1 (de)

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CN104017465A (zh) * 2014-06-24 2014-09-03 山东固耐特新材料有限公司 一种用于车辆板簧及底盘的水性防腐底漆

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CN107764155A (zh) * 2016-08-15 2018-03-06 恩坦华汽车系统（上海）有限公司 天窗粘胶的验证方法
KR102388250B1 (ko) * 2017-06-02 2022-04-20 주식회사 케이씨씨 도료 조성물 및 이를 적용한 천장재
KR102036787B1 (ko) 2018-02-14 2019-10-28 주식회사 케이씨씨 경화제 조성물 및 이를 포함하는 도료 조성물
JP7357251B2 (ja) * 2019-02-04 2023-10-06 株式会社イーエスティージャパン 錆抑制塗料及びその製造方法
JP2021001314A (ja) * 2019-06-18 2021-01-07 ベック株式会社 水性被覆材
JP7161506B2 (ja) * 2019-06-18 2022-10-26 ベック株式会社 水性被覆材

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EP1916282A4 (de) 2009-04-22
WO2007015294A1 (ja) 2007-02-08
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NO20081085L (no) 2008-02-29

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